List of symbols for corrosion research

Here you will find all the symbols used used by us in this knowledge base. Please note, that other publications might use different symbols for the same parameters.

[A]	concentration of A
ß_anodic	Tafel slope for oxidation
ß_cathodic	Tafel slope for cathodic
	derivative of x with respect to y
ε₀	electric field constant
ε_r	relative permittivity
Φ	phase shift
𝜙	CPE parameter: 0 Resistor, 1 Capacitor
τ	time constant of a capacitor (τ = RC)
a	activity
a_Ox	activity of the oxidized species
a_Red	activity of the reduced species
A	area
c	concentration
c^b	bulk conentration
c_Ox	concentration of the oxidized species
c_Red	concentration of the reduced species
C	capacity
C_C	coating capacity
C_dl	double layer capacity
CE	counter electrode
d	distance
E	potential
E⁰	standard potential
E⁰’	formal potential
E^C	charging potential applied to a capacitor
E_corr	corrosion potential
E_pp	primary passivation potential
E_step	step potential during DPV and SWV
E_T	transmission potential for passivation film
f_Ox	activity coefficient of the oxidized species
f_Red	activity coefficient of the reduced species
F	faraday constant
I	electric current
I⁰	current at t = 0
I_cap	capacitive charging current
I_corr	corrosion current
I_crit	critical passivation current
I_pas	passive current / current for passivated material
k	reaction rate
K_L	solubility product
n	amount of substance / order of reaction
Ox	an oxidized species
Q	charge
r	reaction rate
R	resistance or universal gas constant
R_por	pore resistance
R_sol	Solution resistance
R_U	uncompensated resitance
RE	reference electrode
Red	a reduced species
t	time
t_interval	time between two point of measurement
T	temperature
U	voltage
v	scan rate
vs	versus
WE	working electrode
z	electrons transferred per molecule
Z	impedance
Z_CPE	impedance of the CPE
Z_W	Warburg impedance